Perpendicular magnetization in self-assembled films of citrate-capped γ-Fe2O3 nanocrystals on Si(100) surfaces

被引:4
作者
Thomas, PJ [1 ]
Rajamathi, M [1 ]
Vanitha, PV [1 ]
Kulkarni, GU [1 ]
Rao, CNR [1 ]
机构
[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
关键词
self-assembly; mesoscalar assembly; magnetic nanocrystals; perpendicular magnetization; iron oxide nanoparticles;
D O I
10.1166/jnn.2005.067
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
gamma-Fe2O3 nanocrystals capped with citrate and octylamine have been chemically prepared. The octylamine-capped nanocrystals exhibit a tendency to form ordered lattices. Films of nanocrystals of varying thickness (454, 720, and 1400 mu g/cm(2) in the case of citrate-capped nanocrystals and 300 mu g/cm(2) in the case of octylamine-capped nanocrystals) have been prepared on Si(100) substrates by drop casting and have been characterized by X-ray diffraction, scanning electron microscopy, and atomic force microscopy. Magnetic measurements have been carried out on the films as well as on nanocrystal powders. The films of citrate-capped gamma-Fe2O3 nanocrystals exhibit enhanced perpendicular magnetization, with the anisotropy depending on the film thickness.
引用
收藏
页码:565 / 570
页数:6
相关论文
共 30 条
[1]   Influence of substrates on magnetic property and crystalline orientation of CoCrTa/TiCr perpendicular magnetic recording medium [J].
Asahi, T ;
Ikeda, M ;
Takizawa, A ;
Onoue, T ;
Osaka, T .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 212 (1-2) :293-299
[3]  
CHIKUZUMI S, 1964, PHYSICS MAGNETISM
[4]   NONCOLLINEAR SPIN ARRANGEMENT IN ULTRAFINE FERRIMAGNETIC CRYSTALLITES [J].
COEY, JMD .
PHYSICAL REVIEW LETTERS, 1971, 27 (17) :1140-+
[5]   Growth temperature dependence of long-range alloy order and magnetic properties of epitaxial FexPt1-x (x similar or equal to 0.5) films [J].
Farrow, RFC ;
Weller, D ;
Marks, RF ;
Toney, MF ;
Horn, S ;
Harp, GR ;
Cebollada, A .
APPLIED PHYSICS LETTERS, 1996, 69 (08) :1166-1168
[6]   Magnetic resonance of ferrite nanoparticles: evidence of surface effects [J].
Gazeau, F ;
Bacri, JC ;
Gendron, F ;
Perzynski, R ;
Raikher, YL ;
Stepanov, VI ;
Dubois, E .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 186 (1-2) :175-187
[7]   Perpendicular magnetic anisotropy in thin Ni films on GaAs (001) [J].
Haque, SA ;
Itaya, S ;
Yamamoto, Y ;
Hori, H .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2002, 41 (4A) :2014-2017
[8]   Magnetic nanostructures [J].
Himpsel, FJ ;
Ortega, JE ;
Mankey, GJ ;
Willis, RF .
ADVANCES IN PHYSICS, 1998, 47 (04) :511-597
[9]   Origins of perpendicular magnetic anisotropy in Ni/Pd multilayer films [J].
Jeong, JR ;
Kim, YS ;
Shin, SC .
JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5762-5764
[10]   ON SPIN-CANTING IN MAGHEMITE PARTICLES [J].
LINDEROTH, S ;
HENDRIKSEN, PV ;
BODKER, F ;
WELLS, S ;
DAVIES, K ;
CHARLES, SW ;
MORUP, S .
JOURNAL OF APPLIED PHYSICS, 1994, 75 (10) :6583-6585